EUCHNER CES-AH-C03-AH-SM (Unicode) - Manual (Page 18)

Operating Instructions Safety Switch CES-AH-C03-AH-SM
18
Typical system times
Ready delay: After switching on, the unit carries out a self-test for 3 s. The system
is ready for operation only after this time.
Risk time according to EN 60947-5-3: If an actuator moves outside the oper-
ating distance, the safety outputs LA and LB on the corresponding safety switch
are deactivated after a maximum of 260 ms.
Difference time: The safety outputs LA and LB switch with a slight time offset.
They have the same signal state at the latest after a difference time of 50 ms.
System times for "restart after fault" and "normal operation"
Example application: UB = 24 V
+LA permanently connected to UB
+ LB switched by control system
D t
1
= Fault detection time
D t
2
= Fault time (5 s, switch spends this time in the fault state)
D t
3
= PowerUp time (3 s)
D t
4
= Risk time (≤ 260 ms, time from "no actuator" to "outputs switch off")
Figure 3: System times for individual switches
t
Actuator
Start
LA
+LB
LB
DIA (LED red)
Off
On
0 V
+24 V
0 V
+24 V
0 V
+24 V
+LA
0 V
+24 V
0 V
+24 V
None
Detected
Star
t
Fault detection Occurr
ence of a fault
Restar
t
Star
t
Operational No actuator Ausgänge schalten aus Star
t connected together
Actuator detected
∆ t
1
∆ t
2
∆ t
3
∆ t
4